To shield TiAl alloy from hot corrosion attack,a compact protective coating was fabricated by the combination of aluminizing,anodization and pre-oxidation.The hot corrosion behavior of the coated-TiAl specimen was inv...To shield TiAl alloy from hot corrosion attack,a compact protective coating was fabricated by the combination of aluminizing,anodization and pre-oxidation.The hot corrosion behavior of the coated-TiAl specimen was investigated in the mixture salt consisting of 75 wt.%Na2SO4 and 25 wt.%NaCl at 700°C.Results indicated that the anodization and pre-oxidation were beneficial to the generation of Al2O3 layer,which could act as a diffusion barrier to prevent the molten salts and oxygen from diffusing into the alloy during exposure to a hot corrosion environment while the aluminizing coating could provide sufficient aluminum source to support the continuous formation of Al2O3 layer.Moreover,the internal stress of the coating was reduced due to the formation of a gradient coating consisting of TiAl3 and TiAl2.展开更多
一种提高锅炉SCR反应器入口烟温的系统(Gas temperature Rising System,以下简称GRS),以满足锅炉低负荷和/或大气温度低造成SCR入口温度低无法投用脱硝系统时提高烟气温度的需要,从而实现在各种负荷条件下锅炉脱硝系统的正常投用。本系...一种提高锅炉SCR反应器入口烟温的系统(Gas temperature Rising System,以下简称GRS),以满足锅炉低负荷和/或大气温度低造成SCR入口温度低无法投用脱硝系统时提高烟气温度的需要,从而实现在各种负荷条件下锅炉脱硝系统的正常投用。本系统适用于亚临界和超高压的汽包锅炉,包括自然循环汽包炉和强迫循环汽包炉。展开更多
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(51971205)Shenzhen Science and Technology Innovation Program,China(JCYJ20190807154005593)the Fundamental Research Funds for the Central Universities,China(19lgpy20).
文摘To shield TiAl alloy from hot corrosion attack,a compact protective coating was fabricated by the combination of aluminizing,anodization and pre-oxidation.The hot corrosion behavior of the coated-TiAl specimen was investigated in the mixture salt consisting of 75 wt.%Na2SO4 and 25 wt.%NaCl at 700°C.Results indicated that the anodization and pre-oxidation were beneficial to the generation of Al2O3 layer,which could act as a diffusion barrier to prevent the molten salts and oxygen from diffusing into the alloy during exposure to a hot corrosion environment while the aluminizing coating could provide sufficient aluminum source to support the continuous formation of Al2O3 layer.Moreover,the internal stress of the coating was reduced due to the formation of a gradient coating consisting of TiAl3 and TiAl2.
文摘一种提高锅炉SCR反应器入口烟温的系统(Gas temperature Rising System,以下简称GRS),以满足锅炉低负荷和/或大气温度低造成SCR入口温度低无法投用脱硝系统时提高烟气温度的需要,从而实现在各种负荷条件下锅炉脱硝系统的正常投用。本系统适用于亚临界和超高压的汽包锅炉,包括自然循环汽包炉和强迫循环汽包炉。
